Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantos gerentes entrantes Burnley teve?
 ###Tabelas: CREATE TABLE managerial_changes (managerial_changes_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Outgoing manager VARCHAR, Manner of departure VARCHAR, Date of vacancy VARCHAR, Position in table VARCHAR, Incoming manager VARCHAR, Date of appointment VARCHAR) CREATE TABLE second_line_series (second_line_series_id AUTO_INCREMENT PRIMARY KEY, Airing date VARCHAR, English title (Chinese title) VARCHAR, Number of episodes INT, Genre VARCHAR, Official website VARCHAR) CREATE TABLE merchant_ships (merchant_ships_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Flag VARCHAR, Cargo VARCHAR, Fate VARCHAR, Date of attack VARCHAR) CREATE TABLE tallest_buildings_by_pinnacle_height (tallest_buildings_by_pinnacle_height_id AUTO_INCREMENT PRIMARY KEY, Pinn. Rank INT, Std. Rank INT, Name VARCHAR, Pinnacle height ft (m) VARCHAR, Standard height ft (m) VARCHAR, Floors INT, Year INT) CREATE TABLE most_championship_points_in_a_season (most_championship_points_in_a_season_id AUTO_INCREMENT PRIMARY KEY, Driver VARCHAR, Points INT, Season VARCHAR, Races INT, Percentage of possible points VARCHAR)  
SELECT COUNT Incoming manager FROM managerial_changes WHERE Team = Burnley